What is the name for a person who is capable of causing food to
multiply (like Jesus did in the feeding of the 5,000)? I saw this term
somewhere recently--and seem to remember that it was Yiddish,
Buddhist, etc.--but can't recall. Help!

I'm not sure this is the word you're after, but I'll take a stab with
'balshem,' 'Baal Shem,' or "Baal Shem Tov":

"A Baal Shem Tov in Hebrew translates as "Master of a Good Name",
meaning someone who due to his ability to perform super- and
supra-good deeds that benefit others, is "given" the title by those
who recognize or have benefited from his powers. He is essentially a
miracle worker, who supposedly has great spiritual powers.

It's a name that was given in the Middle Ages to a Jewish rabbi
miracle worker who could bring about cures and healing, as well having
mystical powers to foresee or interpret events and personalities. They
were considered to have a "direct line" to Heaven evoking God's
mercies and compassion on suffering human beings."

http://www.fact-index.com/b/ba/baal_shem_tov.html

Best,
?V?